what i get out af al reply's ,high cr is certenly doable but you need a sort of phase plug/rings to compensate path differences.

No.

The phase plugs are there for the purposes of pushing up high frequency response. That was the purpose of the papers posted by Mr. |Geiger. The papers were written to describe means and methods used to push up high frequency response of drivers in high frequency horns. As stated before you can push up the efficiency of a bass horn by means of the compression ratio. But you have to choose your balancing. Many drivers will survive higher pressures than you might think in the home setting. Truth to be told is that we don't push them all that hard for long periods of time. So bottom line is experiment, simulate, and carefully layout your horns. If you build them as per your simulation hornresp is very accurate at predicting what they will perform like.

1 pascal = 0.000 145 037 738 01 pound/square inch.

So roughly ten thousand pascals to one PSI.

Choosing the right cone makeup will let you work with higher pressures. So pick a cone that you can't deform to easily with your hands.

Your throat must be smaller than the wavelength of sound you wish to create. If it is larger than the upper frequency you wish to reproduce it will not work so well.

Next.

You need a driver that will get you this high in frequency response anyway. This is directly related to the drivers voice coil inductance. Remember that to large an inductance cuts out high frequency. And there is pretty much nothing you can do about it.

Driver choice is very important. So as a quick way to figure out the high frequency response try the driver out in hornresp in a sealed or vented enclosure. The low end is unimportant take a look at the high frequency response.

I found something I don't understand (well, nothing new there). Going into an existing simulation, I went to Edit/Tools/System Design/From Specification/Yes/200/2000/OK, and the program calculated new horn values for S1/S2/Hyp. That was expected. But then I noticed that the program also changed the Mmd from 12.89 to 1.61. Bug, or feature? Version 29.10 Product Number 2910-120519.

I found something I don't understand (well, nothing new there). Going into an existing simulation, I went to Edit/Tools/System Design/From Specification/Yes/200/2000/OK, and the program calculated new horn values for S1/S2/Hyp. That was expected. But then I noticed that the program also changed the Mmd from 12.89 to 1.61. Bug, or feature? Version 29.10 Product Number 2910-120519.

Regards,

If you want to keep the driver, you should use System Design/With Driver. System Design From Specification also calculates driver parameters, but I have never seen a case where only Mmd changes. Usually other driver parameters change as well.